Diestock



I. W. NONNEMAN.

DIESTOCK.

APPLICATION FILED FEB. 9. 1920.

Patented Jan. 31,1922.

2 SHEETS-SHEET 1- INVENTQR V W Z0. 7( w ATTORNEYS l. W. NONNEMAN;

DIESTOCK.

APPLICATION FILED FEB. 9, 1920.

Patented Jan. 31, 1922.

2 SHEETS-SHEET 2.

INVENTOR ATTORNEYS Ina w; NonNEMAmoawAR n 01110, AssIGNoa To TH QEDEN comraiir, on WAERENLOHIO; aiooRPoRATIoN OF OHIO a T all, whom' z't ma concern: Breit known that LGIRA VKNONNEMAN, a

citizen of the United 'States,.residing, at

- VVarrem inxthe-countypf Trumbull and State of Ohio,- have invented a certain: new and: useful Improvement: in .Diestocks,, of which :the following is a full, clear, and exact description, reference being had to the 1 accompanying drawings. o

This invention; relates to; a die stock and is: particularlyaconcerned with that type of die-stocks inswhich the guiding frame is cl'a'mpe'dto thepipe, and has a threaded engagement with theichaser"carnyingframe 115 to ;:insure accurateadvancement of the chasers along the; pipe; cam pro ections extending'zfrom the guide; frame 'past the chasersf serving to govern; the recedencem thereo-f;'.-

outwardly with relation to: the pipeito' be threaded to? accomplish accurate cutting of the threads to. exact standard? size on over and undersized threads as desired. Stillnanother object: is the provision of a gear? and screw device .forcausing simultaneous adjustment ofthechasers.

: 'Apreferred embodiment of my invention is illustrated in the accompanying drawings ZlI1*Wl11ICl1-'F1gI"1'1S a facei or frontovi'ew. of

' my die stock; Qiis-a side elevation par tially' in section; Fig. 3 is a face-view of an adjusting camfplatefor the guiding frame; Fig. 4k is a viev'r'similarto Figz'f 1: with the retaining plate and gearmember removed;

.1-i Fig. 5*is a detail perspective ofone of the chase'rs; Figs; 6 and :are 'detailsof yokes each adaptedto engage two chasers and threaded to receive adjusting screws 5 Fig. 8

' is-aniinner fa'cewiewof thegear plate fo actuating the adjustingscrewsyFig; 9 is any enlargedfise'ctional detail through a portion ofthe frame showing the adjusting screws,

. gear plate and recedingcamsi- The chaser carryiiig-iraiheiis shown as 2' comprising-a central sleeve 11 andradial-web 2 integral fwith flanges 3 and 4 from which project outwardly extending 's0ckets'5 to receive the usualdie stock handlesfi." I

=The forward portionof'the sleeve 1 and the.4flange-3-are provided with radial. slots 1 Application filed February 9,1920. Serial-No. 357,234.

' I I nrns'rocx.

- i Specification of Letters Batentf Patented Jai 3.1

or openings adapted toxreceivechasers 10,

each of which has a transverse notch 12 to receive a yoke or-bridgemember 15.. These yokes areshown as: extending partially around-the central sleeve "1. and thenjacross the chasers at right angles-thereto :andv ashavlng their ends slidably engaging parallel guideflanges 14 on each chaser frame; In-

termediateof: thelegs of each yoke is provided a boss 20 internally threaded to receive screws 2l,- "projecting outwardly throughv and'in slidalole and rOtatable en- .ga-gement' with the sleeve 1 andv extending intoo-penings through the sockets 5.

V The outer ends of the screws21- are pro- VlClGClQWlth toothed pinions 22 engaging teeth 23 forming a face gear on: anaannular plate 25 rotatably embracing the; sleeve; .1-

outside-of the chasersandyokesi' this plate'25 are forward; projections -26-for con venientlj rotating the-plate.. This rotation causes corresponding rotation of each; of the screws 21' resulting in: inward or outward movement of the-yokes 15, thus movin'gthe chase'rs correspondingly..- This guiding plate isheld in: its rotatable engagement with I the chaser. carrying frame and with the gear teeth 23 engaging the provided with wings; 36 for convenience tolcjamp or look the platc against the the ends of the screws 21 may ab-ut..fThese;

cam fingers are shown as having their inner 'pinions- 22- by means of a: nut. 35 threaded 011 aa forward extension of the-sleeve 1: and

. in adjusting this nuts This nut alsov-serves surfaces '31 tapered-1 outwardly rearw-ardly of the die stock while the fingers are rigidly carriedby outward projections on: a rmg 33 rotatably .ei-nloracing an "annular groove .formed :lo y shoulders on the: guiding} frame 40 and a retainingnut'llpthus rotation of the' ring and cam fingers with relation: to

the guiding frame ispermitted, but the fingers and ring are-prevented 'fr0m longitudinal movement with relatiomto this frame and aretherebycausedto move through the I chaser carrying frame as the threadingpro gresses. The outer ends of the cam fingers are provided-withoverhanging shoulders 32 adaptedjto engage the periphery. of" the gear plate 25 to serve as a stop fo'r the out threaded.

ward movement of the chaser carrying frame relative to the guiding frame.

To cause relative movement of the chaser frame and guiding frame and to insure the accurate progress of the chasers during the thread cutting operation, I provide master screw threads on the rearward portion of the SlGQVel engaging internal threads at 43 on the guiding frame. These screw threads have a pitch corresponding to the thread to be cut by the chasers l0.

The guiding frame is preferably in the nature of a sleeve, portions of which are cut away for lightness, and having enlargements stfiforming radial guides for clamping jaws 46. Rotatably mounted on the frame is a cam plate4=7having eccentric cam slots or grooves 48 adapted to engage pins 49 rigid with the aws 16 whereby the turning of the plate 4:? moves the gripping jaws inwardly or outwardly. The periphery of the plate 47 may be knurled if desired or for convenience may have an outwardly projecting wing 50 for rotating it with relation to the frame to cause the gripping jaws to engage or release the pipe or other article being 7 When brought into engagement with the pipe the clamping may be made more firm. by use of a screw as indicated at 52'extending through one of the jaws and provided with a pivoted handle 53 whereby the gripping on the pipe may be tightened effectively.

In use the operation of my die stock is as follows:

Assume that the gripping jaws of the guiding frame have been clamped onto a pipe and the set screw 52 tightened, the chasers are now adjusted to cut the thread of the exact diameter desired by relieving the looking and retaining nut 35 and turning the plate 25. This rotates the screws 21 moving the yokes inwardly or outwardly as desired.

The nut 35-is again tightened to clamp the plate against rotation, thus locking the yokes and chasers in the position given them, and the threading operation may proceed. As

the chaser carrying frame moves toward the guiding frame, under" the influence of the threaded connection between them, the screws 21 move along the tapered surfaces 31 of the cam'fingers which allows these screws to slide outwardly with the yokes and chasers, thus tapering the thread being cut.

It will be noted that the yokes 15 have the legs engaging" the chasers at right angles thereto and the outward thrust of the chas- "-I claim:v

1. Ina die stock, the combination of a chaser carrying frame, bridge members extending across a plurality of chasers and means for adjusting said bridge members inwardly and outwardly, means on the chaser carrying frame for simultaneously actuating said means, and variable abutments engaging the adjusting means for controlling the recession of the chasers.

2. In a die stock, the combination of a chaser carrying frame, bridge membersextending across a plurality of chasers and means for adjusting said bridge. members inwardly and outwardly including screwsen gaging the bridge members and inclined v abutments engaging the screws for control ling the recession of the chasers and a revoluble member on the chaser carrying frame for simultaneously rotating said screws.

8. In ,a die stock, the combination of a chaser carrying frame, bridge members each extending across a plurality of chasers and having a guiding engagement with the frame at a plurality of points to receive the outward thrust of the chasers, an adjusting element on each bridge'member and a member carried by the frame :for actuating said adjusting elements.

chaser carrying frame, bridge members'each extending across a plurality of chasers and having an engagement to receive the out= ward thrust of. the chasers, screws engaging the bridge members and a revoluble plate carried. by the frame and having an inwardly facing annular external gear in en gagement with pinions on saidscrews for rotating them to adjustthe chasers.

. I e0 4:. In a die stock, the combination of a 5. In a die stock, the combination of a J chaser carrying frame, yokes each engaging two chasers, a screw engaging each yoke intermediate of its chasers, cam surfacescontrolling recession of the chasers by abutting the outer ends of the screws, a revolgear member journaled on asleeveextension of the frame, a ring screwing onto said extension for clampingthe gear member, and pinions rigid with said screws and engaged bv said gear member. i

7. In a die stock, the combinationof a chaser carrying frame having substantially concentric walls spaced apart, chasers mounted to slide radially, each in-the two walls, a yoke between the walls engaging the chasers, a screw journaled in the outer wall and engaging theyoke, an inwardly facing gear rotatably mounted on the inner wall, and: a pinion on the screw meshing with the gear.

7 8. In a die stock, the combination of a frame having inner and outer. substantially concentric walls spaced apart, radial chasers mounted insaid walls, a yoke between the walls engaging a plurality of chasers, a

screw journaled in the outer wall and engaging the yoke, an inclined'abutment be yond the outer wall engaging the screw to control recession of the chasers, and a rotative annular gear meshing witha pinion'on the screw.

9. In a die stock, the-combination with a and a'member having "gear teetlrmeshing with the pinion for adjusting-the screw.

10; In a die stock, the combination of a 7 frame, aflpair of chasers' slidably mounted therein, 'a bridge member extending across said-chasers and having a sliding engagement beyond the 'chasers-with surfaces on the frame which are parallel to each other, an adjusting screw mounted in the frame and having a threaded engagement with they bridge member, ail-inclined abutment slidably engaging thescrew to-control the; recession of the chasers, a pinion on the screw, and a plate rotatably mounted on the frame 7 and having .an inwardly facing annular gear engaging said pinion.

In testimony whereof, I hereunto aflixmy signature. 7

' IRA NONNEMAN. 

